I noticed the connection piece at my outdoor HVAC unit has been sweating heavily when in use. It is in the 70s recently so not particularly hot out. I am worried about corrosion. Is this normal or should it be insulated like the section above it? Thanks in advance!

Here is an image of the excess moisture

Sweaty pipes

  • 2
    The insulation is looking rather tired and worn, I'd suggest it's time to replace it. Also, it appears that the sweat is primarily on the uninsulated portions.
    – FreeMan
    Oct 27 at 18:22

Condensation occurs more readily at lower temperatures, where the relative humidity is higher. You might not see as much if it was 90. It's not really a problem, as there's almost always some exposed metal anyway, and copper develops a patina that protects it (the brown).

FreeMan's right, though--fix the insulation on the pipe. You lose energy efficiency where the pipe is exposed, so you want at least most of it covered.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.